Process for the preparation of 2-deoxy-2,2-difluoro-.beta.-D-ribo-pentopyranose compounds
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United States of America Patent
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Mar 4, 1997
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app pub date -
May 16, 1996
filing date -
Feb 3, 1995
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Abstract
A process for the preparation of 1-(2'-deoxy-2', 2'-difluoro-D-ribo-pentofuranosyl)-cytosine (VI) from 2-deoxy-2,2-difluoro-.beta.-D-ribo-pentopyranose (I). The process uses a tritylation reaction (Step 3) for preparing 2-deoxy-2,2-difluoro-5-O-triphenylmethyl-ribo-pentofuranose (II) as a key intermediate. The 1-(2'-deoxy-2', 2'-difluoro-D-ribo-pentofuranosyl)-cytosine (VI) is an antiviral and anti-cancer agent.
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